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src/Source/LibJPEG/ansi2knr.c  view on Meta::CPAN

/* Copyright (C) 1989, 2000 Aladdin Enterprises.  All rights reserved. */

/*$Id: ansi2knr.c,v 1.6 2012/01/29 12:23:24 drolon Exp $*/
/* Convert ANSI C function definitions to K&R ("traditional C") syntax */

/*
ansi2knr is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY.  No author or distributor accepts responsibility to anyone for the
consequences of using it or for whether it serves any particular purpose or
works at all, unless he says so in writing.  Refer to the GNU General Public
License (the "GPL") for full details.

Everyone is granted permission to copy, modify and redistribute ansi2knr,
but only under the conditions described in the GPL.  A copy of this license
is supposed to have been given to you along with ansi2knr so you can know
your rights and responsibilities.  It should be in a file named COPYLEFT,
or, if there is no file named COPYLEFT, a file named COPYING.  Among other
things, the copyright notice and this notice must be preserved on all
copies.

We explicitly state here what we believe is already implied by the GPL: if
the ansi2knr program is distributed as a separate set of sources and a
separate executable file which are aggregated on a storage medium together
with another program, this in itself does not bring the other program under
the GPL, nor does the mere fact that such a program or the procedures for
constructing it invoke the ansi2knr executable bring any other part of the
program under the GPL.
*/

/*
 * Usage:
	ansi2knr [--filename FILENAME] [INPUT_FILE [OUTPUT_FILE]]
 * --filename provides the file name for the #line directive in the output,
 * overriding input_file (if present).
 * If no input_file is supplied, input is read from stdin.
 * If no output_file is supplied, output goes to stdout.
 * There are no error messages.
 *
 * ansi2knr recognizes function definitions by seeing a non-keyword
 * identifier at the left margin, followed by a left parenthesis, with a
 * right parenthesis as the last character on the line, and with a left
 * brace as the first token on the following line (ignoring possible
 * intervening comments and/or preprocessor directives), except that a line
 * consisting of only
 *	identifier1(identifier2)
 * will not be considered a function definition unless identifier2 is
 * the word "void", and a line consisting of
 *	identifier1(identifier2, <<arbitrary>>)
 * will not be considered a function definition.
 * ansi2knr will recognize a multi-line header provided that no intervening
 * line ends with a left or right brace or a semicolon.  These algorithms
 * ignore whitespace, comments, and preprocessor directives, except that
 * the function name must be the first thing on the line.  The following
 * constructs will confuse it:
 *	- Any other construct that starts at the left margin and
 *	    follows the above syntax (such as a macro or function call).
 *	- Some macros that tinker with the syntax of function headers.
 */

/*
 * The original and principal author of ansi2knr is L. Peter Deutsch
 * <ghost@aladdin.com>.  Other authors are noted in the change history
 * that follows (in reverse chronological order):

	lpd 2000-04-12 backs out Eggert's changes because of bugs:
	- concatlits didn't declare the type of its bufend argument;
	- concatlits didn't recognize when it was inside a comment;
	- scanstring could scan backward past the beginning of the string; when
	- the check for \ + newline in scanstring was unnecessary.

	2000-03-05  Paul Eggert  <eggert@twinsun.com>

	Add support for concatenated string literals.
	* ansi2knr.c (concatlits): New decl.
	(main): Invoke concatlits to concatenate string literals.
	(scanstring): Handle backslash-newline correctly.  Work with
	character constants.  Fix bug when scanning backwards through
	backslash-quote.  Check for unterminated strings.
	(convert1): Parse character constants, too.
	(appendline, concatlits): New functions.
	* ansi2knr.1: Document this.

	lpd 1999-08-17 added code to allow preprocessor directives
		wherever comments are allowed
	lpd 1999-04-12 added minor fixes from Pavel Roskin
		<pavel_roskin@geocities.com> for clean compilation with
		gcc -W -Wall
	lpd 1999-03-22 added hack to recognize lines consisting of
		identifier1(identifier2, xxx) as *not* being procedures
	lpd 1999-02-03 made indentation of preprocessor commands consistent
	lpd 1999-01-28 fixed two bugs: a '/' in an argument list caused an
		endless loop; quoted strings within an argument list

src/Source/LibJPEG/ansi2knr.c  view on Meta::CPAN

#  else
     extern char *malloc();
     extern int free();
#  endif
# endif

#endif

/* Define NULL (for *very* old compilers). */
#ifndef NULL
# define NULL (0)
#endif

/*
 * The ctype macros don't always handle 8-bit characters correctly.
 * Compensate for this here.
 */
#ifdef isascii
# undef HAVE_ISASCII		/* just in case */
# define HAVE_ISASCII 1
#else
#endif
#if STDC_HEADERS || !HAVE_ISASCII
# define is_ascii(c) 1
#else
# define is_ascii(c) isascii(c)
#endif

#define is_space(c) (is_ascii(c) && isspace(c))
#define is_alpha(c) (is_ascii(c) && isalpha(c))
#define is_alnum(c) (is_ascii(c) && isalnum(c))

/* Scanning macros */
#define isidchar(ch) (is_alnum(ch) || (ch) == '_')
#define isidfirstchar(ch) (is_alpha(ch) || (ch) == '_')

/* Forward references */
char *ppdirforward();
char *ppdirbackward();
char *skipspace();
char *scanstring();
int writeblanks();
int test1();
int convert1();

/* The main program */
int
main(argc, argv)
    int argc;
    char *argv[];
{	FILE *in = stdin;
	FILE *out = stdout;
	char *filename = 0;
	char *program_name = argv[0];
	char *output_name = 0;
#define bufsize 5000			/* arbitrary size */
	char *buf;
	char *line;
	char *more;
	char *usage =
	  "Usage: ansi2knr [--filename FILENAME] [INPUT_FILE [OUTPUT_FILE]]\n";
	/*
	 * In previous versions, ansi2knr recognized a --varargs switch.
	 * If this switch was supplied, ansi2knr would attempt to convert
	 * a ... argument to va_alist and va_dcl; if this switch was not
	 * supplied, ansi2knr would simply drop any such arguments.
	 * Now, ansi2knr always does this conversion, and we only
	 * check for this switch for backward compatibility.
	 */
	int convert_varargs = 1;
	int output_error;

	while ( argc > 1 && argv[1][0] == '-' ) {
	  if ( !strcmp(argv[1], "--varargs") ) {
	    convert_varargs = 1;
	    argc--;
	    argv++;
	    continue;
	  }
	  if ( !strcmp(argv[1], "--filename") && argc > 2 ) {
	    filename = argv[2];
	    argc -= 2;
	    argv += 2;
	    continue;
	  }
	  fprintf(stderr, "%s: Unrecognized switch: %s\n", program_name,
		  argv[1]);
	  fprintf(stderr, usage);
	  exit(1);
	}
	switch ( argc )
	   {
	default:
		fprintf(stderr, usage);
		exit(0);
	case 3:
		output_name = argv[2];
		out = fopen(output_name, "w");
		if ( out == NULL ) {
		  fprintf(stderr, "%s: Cannot open output file %s\n",
			  program_name, output_name);
		  exit(1);
		}
		/* falls through */
	case 2:
		in = fopen(argv[1], "r");
		if ( in == NULL ) {
		  fprintf(stderr, "%s: Cannot open input file %s\n",
			  program_name, argv[1]);
		  exit(1);
		}
		if ( filename == 0 )
		  filename = argv[1];
		/* falls through */
	case 1:
		break;
	   }
	if ( filename )
	  fprintf(out, "#line 1 \"%s\"\n", filename);
	buf = malloc(bufsize);
	if ( buf == NULL )